aboutsummaryrefslogtreecommitdiffstats
path: root/parport.c
blob: 5c4d597e9bb5e9ad41c12dea58823592f87700f0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
/* $Id: parport.c,v 1.12 2004/01/09 04:16:06 reinelt Exp $
 *
 * generic parallel port handling
 *
 * Copyright 2003 Michael Reinelt <reinelt@eunet.at>
 *
 * This file is part of LCD4Linux.
 *
 * LCD4Linux is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2, or (at your option)
 * any later version.
 *
 * LCD4Linux is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 *
 * $Log: parport.c,v $
 * Revision 1.12  2004/01/09 04:16:06  reinelt
 * added 'section' argument to cfg_get(), but NULLed it on all calls by now.
 *
 * Revision 1.11  2003/10/08 14:21:10  reinelt
 * Changelog; small type in parport.c
 *
 * Revision 1.10  2003/10/05 17:58:50  reinelt
 * libtool junk; copyright messages cleaned up
 *
 * Revision 1.9  2003/10/03 03:53:12  reinelt
 * compile error in parport fixed (thanks to Andrew from FilmCan)
 *
 * Revision 1.8  2003/09/09 06:54:43  reinelt
 * new function 'cfg_number()'
 *
 * Revision 1.7  2003/08/24 05:17:58  reinelt
 * liblcd4linux patch from Patrick Schemitz
 *
 * Revision 1.6  2003/08/22 03:45:09  reinelt
 * bug in parallel port code fixed, more icons stuff
 *
 * Revision 1.5  2003/08/19 05:23:55  reinelt
 * HD44780 dual-controller patch from Jesse Brook Kovach
 *
 * Revision 1.4  2003/08/16 07:31:35  reinelt
 * double buffering in all drivers
 *
 * Revision 1.3  2003/08/15 07:54:07  reinelt
 * HD44780 4 bit mode implemented
 *
 * Revision 1.2  2003/04/07 06:03:05  reinelt
 * further parallel port abstraction
 *
 * Revision 1.1  2003/04/04 06:02:03  reinelt
 * new parallel port abstraction scheme
 *
 */

/* 
 * exported functions:
 * 
 * int parport_open (void)
 *   reads 'Port' entry from config and opens
 *   the parallel port
 *   returns 0 if ok, -1 on failure
 *
 * int parport_close (void)
 *   closes parallel port
 *   returns 0 if ok, -1 on failure
 *
 * unsigned char parport_wire_ctrl (char *name, char *deflt)
 *   reads wiring for one control signal from config
 *   returns PARPORT_CONTROL_* or 255 on error
 *
 * unsigned char parport_wire_data (char *name, char *deflt)
 *   reads wiring for one data signal from config
 *   returns 1<<bitpos or 255 on error
 *
 * void parport_direction (int direction)
 *   0 - write to parport
 *   1 - read from parport
 *
 * void parport_control (unsigned char mask, unsigned char value)
 *   frobs control line and takes care of inverted signals
 *
 * void parport_toggle (unsigned char bit, int level, int delay)
 *   toggles the line <bit> to <level> for <delay> nanoseconds
 *
 * void parport_data (unsigned char value)
 *   put data bits on DB1..DB8
 *
 * unsigned char parport_read (void)
 *   reads a byte from the parallel port
 *
 * void parport_debug(void)
 *   prints status of control lines
 */


#include "config.h"

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <time.h>
#include <errno.h>
#include <sys/ioctl.h>


#ifdef HAVE_SYS_IO_H
#include <sys/io.h>
#define WITH_OUTB
#else
#ifdef HAVE_ASM_IO_H
#include <asm/io.h>
#define WITH_OUTB
#endif
#endif

#if defined (HAVE_LINUX_PARPORT_H) && defined (HAVE_LINUX_PPDEV_H)
#define WITH_PPDEV
#include <linux/parport.h>
#include <linux/ppdev.h>
#else
#define PARPORT_CONTROL_STROBE    0x1
#define PARPORT_CONTROL_AUTOFD    0x2
#define PARPORT_CONTROL_INIT      0x4
#define PARPORT_CONTROL_SELECT    0x8
#endif

#if !defined(WITH_OUTB) && !defined(WITH_PPDEV)
#error neither outb() nor ppdev() possible
#error cannot compile parallel port driver
#endif


#include "debug.h"
#include "cfg.h"
#include "udelay.h"
#include "parport.h"


static unsigned short Port=0;
static char *PPdev=NULL;

// initial value taken from linux/parport_pc.c
static unsigned char ctr = 0xc;

#ifdef WITH_PPDEV
static int PPfd=-1;
#endif


int parport_open (void)
{
  char *s, *e;
  
#ifdef USE_OLD_UDELAY
  if (cfg_number(NULL, "Delay", 0, 1, 1000000000, &loops_per_usec)<0) return -1;
#else
  udelay_init();
#endif
  
  s=cfg_get (NULL, "Port", NULL);
  if (s==NULL || *s=='\0') {
    error ("parport: no 'Port' entry in %s", cfg_source());
    return -1;
  }
  PPdev=NULL;
  if ((Port=strtol(s, &e, 0))==0 || *e!='\0') {
#ifdef WITH_PPDEV
    Port=0;
    PPdev=s;
#else
    error ("parport: bad Port '%s' in %s", s, cfg_source());
    return -1;
#endif
  }
  
  
#ifdef WITH_PPDEV
  
  if (PPdev) {
    debug ("using ppdev %s", PPdev);
    PPfd=open(PPdev, O_RDWR);
    if (PPfd==-1) {
      error ("parport: open(%s) failed: %s", PPdev, strerror(errno));
      return -1;
    }
    
#if 0
    // Fixme
    if (ioctl(PPfd, PPEXCL)) {
      debug ("ioctl(%s, PPEXCL) failed: %s", PPdev, strerror(errno));
    } else {
      debug ("ioctl(%s, PPEXCL) succeded.");
    }
#endif
    
    if (ioctl(PPfd, PPCLAIM)) {
      error ("parport: ioctl(%s, PPCLAIM) failed: %d %s", PPdev, errno, strerror(errno));
      return -1;
    }
  } else
    
#endif
    
    {
      debug ("using raw port 0x%x", Port);
      if ((Port+3)<=0x3ff) {
	if (ioperm(Port, 3, 1)!=0) {
	  error ("parport: ioperm(0x%x) failed: %s", Port, strerror(errno));
	  return -1;
	}
      } else {
	if (iopl(3)!=0) {
	  error ("parport: iopl(1) failed: %s", strerror(errno));
	  return -1;
	}
      }
    }
  return 0;
}


int parport_close (void)
{
#ifdef WITH_PPDEV
  if (PPdev) {
    debug ("closing ppdev %s", PPdev);
    if (ioctl(PPfd, PPRELEASE)) {
      error ("parport: ioctl(%s, PPRELEASE) failed: %s", PPdev, strerror(errno));
    }
    if (close(PPfd)==-1) {
      error ("parport: close(%s) failed: %s", PPdev, strerror(errno));
      return -1;
    }
  } else 
#endif    
    {
      debug ("closing raw port 0x%x", Port);
      if ((Port+3)<=0x3ff) {
	if (ioperm(Port, 3, 0)!=0) {
	  error ("parport: ioperm(0x%x) failed: %s", Port, strerror(errno));
	  return -1;
	} 
      } else {
	if (iopl(0)!=0) {
	  error ("parport: iopl(0) failed: %s", strerror(errno));
	  return -1;
	}
      }
    }
  return 0;
}


unsigned char parport_wire_ctrl (char *name, unsigned char *deflt)
{
  unsigned char w;
  char wire[256];
  char *s;
  
  snprintf (wire, sizeof(wire), "Wire.%s", name);
  s=cfg_get (NULL, wire, deflt);
  if (strcasecmp(s,"STROBE")==0) {
    w=PARPORT_CONTROL_STROBE;
  } else if(strcasecmp(s,"AUTOFD")==0) {
    w=PARPORT_CONTROL_AUTOFD;
  } else if(strcasecmp(s,"INIT")==0) {
    w=PARPORT_CONTROL_INIT;
  } else if(strcasecmp(s,"SELECT")==0) {
    w=PARPORT_CONTROL_SELECT;
  } else if(strcasecmp(s,"GND")==0) {
    w=0;
  } else {
    error ("parport: unknown signal <%s> for wire <%s>", s, name);
    error ("         should be STROBE, AUTOFD, INIT, SELECT or GND");
    return 0xff;
  }

  if (w&PARPORT_CONTROL_STROBE) {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:STROBE]", name);
  }
  if (w&PARPORT_CONTROL_AUTOFD) {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:AUTOFD]", name);
  }
  if (w&PARPORT_CONTROL_INIT) {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:INIT]", name);
  }
  if (w&PARPORT_CONTROL_SELECT) {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:SELECT]", name);
  }
  if (w==0) {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:GND]", name);
  }
  
  return w;
}


unsigned char parport_wire_data (char *name, unsigned char *deflt)
{
  unsigned char w;
  char wire[256];
  char *s;
  
  snprintf (wire, sizeof(wire), "Wire.%s", name);
  s=cfg_get (NULL, wire, deflt);
  if(strlen(s)==3 && strncasecmp(s,"DB",2)==0 && s[2]>='0' && s[2]<='7') {
    w=s[2]-'0';
  } else if(strcasecmp(s,"GND")==0) {
    w=0;
  } else {
    error ("parport: unknown signal <%s> for wire <%s>", s, name);
    error ("         should be DB0..7 or GND");
    return 0xff;
  }
  
  if (w==0) {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:GND]", name);
  } else {
    info ("wiring: [DISPLAY:%s]<==>[PARPORT:DB%d]", name, w);
  }
  
  w=1<<w;

  return w;
}


void parport_direction (int direction)
{
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl (PPfd, PPDATADIR, &direction);
  } else
#endif
    {
      // code stolen from linux/parport_pc.h
      ctr = (ctr & ~0x20) ^ (direction?0x20:0x00);
      outb (ctr, Port+2);
    }
}


void parport_control (unsigned char mask, unsigned char value)
{
  // any signal affected?
  // Note: this may happen in case a signal is hardwired to GND
  if (mask==0) return;

  // Strobe, Select and AutoFeed are inverted!
  value = mask & (value ^ (PARPORT_CONTROL_STROBE|PARPORT_CONTROL_SELECT|PARPORT_CONTROL_AUTOFD));

#ifdef WITH_PPDEV
  if (PPdev) {
    struct ppdev_frob_struct frob;
    frob.mask=mask;
    frob.val=value;
    ioctl (PPfd, PPFCONTROL, &frob);
  } else
#endif
    {
      // code stolen from linux/parport_pc.h
      ctr = (ctr & ~mask) ^ value;
      outb (ctr, Port+2);
    }
}


void parport_toggle (unsigned char bits, int level, int delay)
{
  unsigned char value1, value2;

  // any signal affected?
  // Note: this may happen in case a signal is hardwired to GND
  if (bits==0) return;

  // prepare value
  value1=level?bits:0;
  value2=level?0:bits;
  
  // Strobe, Select and AutoFeed are inverted!
  value1 = bits & (value1 ^ (PARPORT_CONTROL_STROBE|PARPORT_CONTROL_SELECT|PARPORT_CONTROL_AUTOFD));
  value2 = bits & (value2 ^ (PARPORT_CONTROL_STROBE|PARPORT_CONTROL_SELECT|PARPORT_CONTROL_AUTOFD));
  
 
#ifdef WITH_PPDEV
  if (PPdev) {
    struct ppdev_frob_struct frob;
    frob.mask=bits;
    
    // rise
    frob.val=value1;
    ioctl (PPfd, PPFCONTROL, &frob);
    
    // pulse width
    ndelay(delay);      
    
    // lower
    frob.val=value2;
    ioctl (PPfd, PPFCONTROL, &frob);
  } else
#endif
    {
      // rise
      ctr = (ctr & ~bits) ^ value1;
      outb (ctr, Port+2);

      // pulse width
      ndelay(delay);      
      
      // lower
      ctr = (ctr & ~bits) ^ value2;
      outb (ctr, Port+2);
    }
}


void parport_data (unsigned char data)
{
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl(PPfd, PPWDATA, &data);
  } else
#endif
    {
      outb (data, Port);
    }
}

unsigned char parport_read (void)
{
  unsigned char data;
  
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl (PPfd, PPRDATA, &data);
  } else
#endif
    {
      data=inb (Port);
    }
  return data;
}


void parport_debug(void)
{
  unsigned char control;
  
#ifdef WITH_PPDEV
  if (PPdev) {
    ioctl (PPfd, PPRCONTROL, &control);
  } else 
#endif
    {
      control=ctr;
    }
  
  debug ("%cSTROBE %cAUTOFD %cINIT %cSELECT", 
	 control & PARPORT_CONTROL_STROBE ? '-':'+',
	 control & PARPORT_CONTROL_AUTOFD ? '-':'+',
	 control & PARPORT_CONTROL_INIT   ? '+':'-',
	 control & PARPORT_CONTROL_SELECT ? '-':'+');
  
}